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Home My WebLink AboutSOIL EXPLORATION - PENETROMERFlorida's Leading Engineering Source Environmental • Geotechnical • Construction Materials Testing • Threshold and Special Inspections • Plan Review & Code Compliance Mr. Dave Gruber 10725 S Ocean Dr, Lot 479 St. Lucie County, Florida 34957 MANNED sly 2 Bt Lucie C'OU' RE: Soil Exploration - Proposed Two -Story Residence 10725 S Ocean Dr. (Lot 490'Holiday Out), St. Lucie County, FL GFA Project # 17-6576.00 August 20, 2017 GFA International performed soil testing .with one Standard Penetration Test (SPT) boring and one auger boring with hand Gone penetrometers at the above referenced project. Based on the test results, the soil on which the referenced structure is to rest is capable of sustaining a safe bearing capacity ofe�;5Q0 psf. The subsurface exploration activities were performed in accordance with Chapter 18 of the Florida Building Code (latest addition) and applicable ASTM standards. For detailed information on subsurface conditions encountered, please refer to the logs attached to this letter. We recommend that the bottom of the footings be founded at a depth of at least 12 inches below finish grade. The depth shall be measured from the lowest adjacent grade. We also recommend a minimum footing width of 18 inches for spread footings and 16 inches for monolithic footings, but not less than 8 inches more than the width of the imposed wall. This report does not state or imply that the foundation soils at the bearing level will remain in the original condition in which they were found during the. subsurface exploration activities. Exposure to the environment may weaken the foundation soils at the bearing level if the foundation excavations remain open for a long period of time, or if the foundation soils are exposed to rainfall. Consequently, it is recommended that the excavations for the wall and column footings be performed to final grade and footings constructed as soon as possible to minimize potential damage of the bearing soils. GFA estimates the site is at or near final grade. It is also recommended that the 2 feet below existing grade, the bottom of all new footing excavations and slabs, and all fill material, be compactedto a minimum density of 95% of the Modified Proctor (ASTM D-1557) prior to the placement of the concrete for the footings. Foundations and any below grade remains of any structures that are within the footprint of the new construction should be removed so as to not affect structures. Analysis of the foundation performance under hurricane conditions or other storm events, including the effects of loss of soil support due to scour or other forces, is not within the scope of this report, and the recommendations are valid only for normal conditions. Additional analysis and options for foundation systems with scour conditions or other scenarios can be performed if requested. 607 NW Commodity Cove • Port St. Lucie, Florida 34986 • (772) 924.3575 • (772) 924.3580 (fax) • www.teamgfa.com OFFICES THROUGHOUT FLORIDA PrapQsed Two -Story Residence August 20, 2017 10125 S Ocean Dr (Lot 490 Holiday Out), St. Lucie County, FL GFA Project# 17-6576.00 GFA should be provided the opportunity to review the final foundation specifications and review foundation design drawings, in order to determine whether GFA's recommendations have been properly interpreted, communicated and implemented. If GFA is not afforded the opportunity -to participate in construction related aspects of foundation installation as recommended in this report or any report addendum, GFA will accept no responsibility for the interpretation of our recommendations made in this report or on a report addendum for foundation performance. Sincerely, GFA Intern�"i allDl ft°°°o FBPE SN E N• ;cQSS 4653 Paul Fj'EEOF .Regiorsident • CVO' Florida F�`trtdiaR �G� .,..• ONAL IstJJ Attachments: Test Location Plan, Standard Notes Related to Test Borings Copies: Client (2) rinCollie, E.I. Poenager Penetration Test (SPT) Borings (2), Vicinity Map 10725 S Ocean Dr. (Lot 490 Holiday Out) St. Lucie County, FL GFA Project No. 17-6576.00 X c Test Location Plan 10725 S Ocean Dr. (Lot 490 Holiday Out) St. Lucie County, FL GFA Project No. 17-6576.00 Legend Approximate Standard Penetration Test (SPT) Boring & Auger Boring (AB) Locations T x GFA INTERNATIONAL 521 N.W. ENTERPRISE DRIVE. PORT ST. LUCIE. FLORIDA 34986 PHONE: (772) 924-3575 - FAx: (772) 924-3580 STANDARD PENETRATION TEST BORING (ASTM D-1586) Client: Mr. Dave Gruber Project No.:17-6576.00 Lab No.: Project: 10725 S Ocean Dr (Lot 490 Holiday Out) Page: 1 of 1 St. Lucie County, FL Date: 8/10/2017 Elevation: Existing Grade Drill Rig: Simco-24 Water Level: 4.2 feet after 0 hours Drilling Fluid commenced at depth of 10 feet Field Party: PM/CC/MM TEST LOCATION: SPT -1 N27.27209° W80.20604° Laboratory Tests Depth Blows/ N Sample Layer: USCS Description Passing Moisture Organic (feet) 6 in. Value No. From/to No. 200 Content Content 0 .......................... 4 0-2 SP Brown fine sand _ -- 4 1 ............ ............ I --- 3 7 1 2 --- .....5................... 3 2-4 Brown fine sand, some shell 5 3 15 20 2 _-- 4 4 --- .... ................. 6 4-6 Gray fine sand, trace cemented sand, trace shell 5 7 .......................... __- 10 17 3 6 ...... �................ 6 6-16 Gray fine sand, trace shell 7 10 .......................... _-- 18 28 4 g20 ................ ......... . --- 15 20 5 30 10 ................ ......... 10 12 15 27 6 _-- 12 ....18................. 12 --- 13 ....13................ _-- 14 27 7 14 ....1 ................. 15 .........10 ................ _-- 10 20 8 16 -- ............. ............. Boring Terminated at 16 feet 17 ........ ....... 18 ........ ....... ] 9 ........ ....... GFA INTERNATIONAL 521 N.W. ENTERPRISE DRIVE; PORT ST. LUCIE. FLORIDA 34986 PHONE: (772) 924-3575 - FAX: (772) 924-3580 STANDARD PENETRATION TEST BORING (ASTM D-1586) Client: Mr. Dave Gruber Project No.:17-6576.00 Lab No.: Project: 10725 S Ocean Dr (Lot 490 holiday Out) Page: 1 of 1 St. Lucie County, FL Date: 8/10/2017 Elevation: Existing Grade Drill Rig: Simco-24 Water Level: 4 feet after 0 hours Drilling Fluid commenced at depth of 10 feet Field Party: PM/CC/MM TEST LOCATION: SPT - 2 N27.272080 W80.205900 Laboratory Tests Depth Blows/ N Sample Layer ' USCS Description Passing Moisture Organic (feet) 6 in. Value No. From/to No. 200 Content Content 0 0-3 SP Brown fine sand 20 2 HCP— 30 3 HCP= 80+ 3-5 SP Gray fine sand, trace silt and clay, little shell --- 2 4 HCP= 80+ 7 -- 5 21 5-7 SP Light gray cemented sand --- 23 44 3 6 7 ................ ....... ... 8 -- 7 11 .......................... 7-10 SP Gray fine sand 14 25 4 --- 15 8 ................ 21 ...... ... --- 2-5 25 9 _-- .... ................. 25 50 5 10 .... ................ Boring Terminated at 16 feet 11 ........ ....... 12 ........ ....... 13 ........ ....... 14 ........ ....... 15 ........ ....... 16 ........ ....... 17 ........ ....... 18 ........ ....... 19 ........ ....... � i I NOTES RELATED TO RECORDS OF TEST BORING AND GENERALIZED SUBSURFACE PROFILE 1. Groundwater level was encountered and recorded (if shown) following the completion of the soil test boring on the date indicated. Fluctuations in groundwater levels are common; consult report text for a discussion. 2. The boring location was identified in the field by offsetting from existing reference marks and using a cloth tape and survey wheel. 3. The borehole was backfilled to site grade following boring completion, and patched with asphalt cold patch mix when pavement was encountered. 4. The Record of Test Boring represents our interpretation of field conditions based on engineering examination of the soil samples. 5. The Record of Test Boring is subject to the limitations, conclusions and recommendations presented in the Report text. 6. "Field Test Data" shown on the Record of Test Boring indicated as 11/6 refers to the Standard Penetration Test (SPT) and means 11 hammer blows drove the sampler 6 inches. SPT uses a 140-pound hammer falling 30 inches. 7. The N-value from the SPT is the sum of the hammer blows required to drive the sampler the second and third 6- inch increments. 8. The soil/rock strata interfaces shown on the Records of Test Boring are approximate and may vary from those shown. The soil/rock conditions shown on the Records of Test Boring refer to conditions at the specific location tested; soil/rock conditions may vary between test locations. 9. Relative density for sands/gravels and consistency for silts/clays are described as follows: SPT CPT SANDS/GRAVELS SPT CPT SILTS/CLAYS BLOWS/FOOT KG/CM RELATIVE DENSITY BLOWS/FOOT KG/CM1 CONSISTENCY 0-4 0-16 Very loose 0-1 0-3 Very soft 5-10 17-40 Loose 2-4 4-6 Soft 11-30 41-120 Medium Dense 5-8 7-12 Firm 31-50 1 121-200 1 Dense 9-15 13-25 Stiff 50+ over 200 VeryDense 16-30 25-50 Very, stiff >30 >50 Hard 10. Grain size descriptions areas follows: NAME SIZE LIMITS Boulder 12 Inches or more Cobbles 3 to 12 Inches Coarse Gravel % to 3 Inches Fine Gravel No. 4 sieve to % inch Coarse Sand No. 10 to No. 4 sieve Medium Sand No. 40 to No. 10 sieve Fine Sand No. 200 to No. 40 sieve Fines Smaller than No. 200 sieve 11. Definitions related to adjectives used in soil/rock descriptions: PROPORTION ADJECTIVE APPROXIMATE ROOT DIAMETER ADJECTIVE <5% Trace Less than 1/32" Fine roots 5%'to 12% Little 1/32" to Small roots 12% to 30% Some '/d' to V Medium roots 30% to 50% And Greater than V Large roots Organic Soils: Soils containing vegetable tissue in various stages of decomposition that has a fibrous to amorphous texture, usually a dark brown to black color, and an organic odor. Organic Content <25%: Slightly to Highly Organic; 25% to 75%: Muck; >75%: Peat